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Space Shuttle abort modes
Space Shuttle abort modes were procedures by which the nominal launch of the NASA Space Shuttle could be terminated. A pad abort occurred after ignition of the shuttle's main engines but prior to liftoff. An abort during ascent that would result in the orbiter returning to a runway or to a lower than planned orbit was called an intact abort, while an abort in which the orbiter would be unable to reach a runway, or any abort involving the failure of more than one main engine, was called a contingency abort. Crew bailout was still possible in some situations where the orbiter could not land on a runway.
== Redundant Set Launch Sequencer (RSLS) abort ==
The three Space Shuttle Main Engines were ignited roughly 6.6 seconds before liftoff, and computers monitored their performance as they built up thrust. If an anomaly was detected, the engines would be shut down automatically and the countdown terminated before ignition of the Solid Rocket Boosters (SRBs) at T - 0 seconds. This was called a Redundant Set Launch Sequencer (RSLS) abort, and happened five times: STS-41-D, STS-51-F, STS-51, STS-55, and STS-68.〔(NASA - Mission Profile )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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